Type-writing machine.



PatentedApr. 16, 1912.

pnrrn srars a a carton.

BENJAMIN P. FOR-TIN, OF HARTFORD, CONNECTICUT, ASSIGNOR T0 UNDERWOOD TYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPE-WRITING- MACHINE.

Specification of Letters Patent.

' Patented Apr. 1c, 1912.

To all whom it may concern:

Be it known that I, BENJAMIN P. FoRTIN, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in .TypelVriting Machines, of which the following is a specification.

The present invention relates to mechanism for back spacing the carriage of a typewriting machine by means of a key or similar device, so that upon each operation of the key the carriage may be moved back a definite distance, ordinarily a single space, and thereupon be arrested. In mechanism of this class, there is ordinarily provided a dog which is normally disengaged from the carriage rack but which, when the back spacing key is operated, first moves into engagement with the rack and then moves back with the rack a single space. Stops, also actuated from the key, are usually provided for engaging the rack from above when the key is operated to prevent the rack from riding over the dog and thus being overthrown by reason of the momentum of the carriage; and for holding the escapement wheel against movement during the back spacing operation.

One object of the present invention is a simplified means for actuating the back spacing dog, to the end that a single element may effect both the rack-engaging. movement of the dog and the movementof the dog with the carriage.

Another object of the invention is the elimination of unnecessary parts by operating the stop which prevents displacement and overthrow of the carriage, and the stop which prevents movement of the escapement wheel, both from a single element, preferably the element which directly actuates the dog, so that these stops are brought to effective position at the proper time.

The invention in general has for its object to simplify and render more certain and positive the operation of mechanism of this class. r

The above and other specific objects and features of the invention will presently and more fully appear in connection with the accompanying drawings in which Figure 1 is a view in perspective of so much of the mechanism of the typewriting machine as relates to the present invention.

Fig. 2 is an enlarged view in front elevation of .the mechanism which is operated from the back spacing key, the parts being shown 1n normal position. Flg. 3 is a view of the parts shown in Fig. 2 at the'end of the back spacing movement, before the key is released. Fig. 1 is a view similar to Fig.2 with the parts in the position assumed when the back spacing dog has been broughtto the rack, but before the dog has been moved back with the rack. Fig. 5 is a detail perspective view showing more clearly the means by which the stops for the rack and escapement wheel are operated.

The carriage of the typewriter includes a rack'which is indicated at 1. This rack is supported on arms 2 pivoted at 3 to the frame pf the carriage .in a well known manner. One of the arms 2 is extended beyond the pivot to form a release key lev'er at for swinging the rack upward by means of the arms 2 to disenga ge. the rack from the pinion 5 which forms part of the 'escapement mechanism. The carriage is driven from the usual spring drum by means of a strap connection. The usual escapement wheel 6 and dog 6 control the step-by-step or letter feed movement, of the carriage. The pinion 5 which normally engages the rack, is loosely mounted on the stud 5 to which the escapement wheel is fixed. A pawl 7 pivotally attached to the face of the escapement wheel 6 is held against the pinion 5 by means of a spring 8, in such manner that the pinion is locked to the escapement Wheel to be controlled by the latter during the advance movement of the carriage. During the back spacing movement of the carriage rack, how'- ever, the teeth of the pinion pass idly over riage is back spaced by means of a dog 9 operated from a back spacing key 10, on a key lever 11, pivoted at 12 to the frame A.

The lever 11 connects, by means of a link 13, with the arm 14 of'a lever pivoted at 15 to a bracket 22 on the frame. The lever pivoted at 15 has an arm 16 which extends vertically and is then ofi-set horizontally, and at its end engages by means of slot 17, a pin 17 in a lever 18. Thelever 18 is pivoted at 19 to a bracket 20, which in turn is secured at 21 on the bracket 22 of the frame. The bracket 20 has an arm 23 (see Fig. 5) carrying a stud 24 which forms an attachment Mo Fi m] for the dog to the. rocker. The (log is slotted at so that the clog .u'iziy have not only :1 rocking movement but u longitutiinzil moven'ieut on the stucl Also pivotully iiiountetl on the stuci 2% is it lever liaivin an arm 26 at the end. of which is 2 tooth or (ltllflll 2? turned at right angles to the face of the (W111 526 to extend over the rock 1, so that when the arm is depressed, the rock may he engaged on its upper surface and hel l flown by the cletent :27, hereinafter to he described. lhe arm also calories a tooth oi. detent 28 extending rearwardly at right angles to the arm 26, so that, when llllll 26 is depressedfdetent 28 may engage the escnpement wheel 6 to prevent movement of the hotel (luring the heck ueing operitllOll.

The (log 9 carries a pin engaging the le ver 18, so that the clog may be actuated by the lever 18 when the latter is moved loy lever 16. through the pin antl slot connection 1'l17 upon operational the heel; spacing key. The leverl at its upper entl has; two teeth or (letents 30 and 31, somewhat spuceol one from the other, and con neetecl by a coin surface 32 against which bears the pin 29 of the (log 9. The ineliuulion of the surface 32 is from the tooth 31 upward to the stop 30, so that when the lever 18 is ioekeel clockwise, (looking fi'om the front). the engagement of the mun suri aee with the pin 29 causes toe dog to be lifterl or swung upward around its pivot 2% from the position shown in Fig. 2 to the sition shown in Fig. 1-, thus to be brought into engagement with the rack The le ver, of which the arm 26 is a portion, has also below its pivot a second mun 33 eze lending to the right and terminating in ii (um 34 formed by its upper surface. Pin I? carried by the lever 18, anti means of which the lever 18 is connected to the lever ill. oxtei'ivls beyond the rear SllPfHCG of the lever 18 to permit tohe l by the mm 34-, as shown llln'illQ various figures. hen the lever 18 is roelteel to the tight by the level- 16, the pin 1 hy engagement with the com after u sullioient iiioveznent of o lever 18, ezuises the. lever 26--33 to be t0 bring the tienst the rack Zzilll l l'oolierl around its pivot lell'l or tooth 2'? tlown 2' lo bring the detent 01 too 28 into eugugewent with the eseepeinent. wheel. As shown in Fig. 4 the movement of the lever 18 in bringing the clog J to the viii-k, (loos not move the pin 1.? suilieiently over the mini 34 to liking the (letenls Zllltl ills iiilo engagement with the reel; 21ml oscupement wheel ii'espeotively. Further.movemeut of; the lever 18 to the right from the position shown in Fig. 4 to the position shown in i l i Fig. 3. causes the arm 26 to h ring cletents 27 owl 2% to the self and wheel, respectively.

The u'ioveinent oi the lei-e2: beyond the key lever system.

eeszoo k osition "he ole 38, if on to carry the dog he slot perniittii s the dog th right. with the earriage melt, t. ill epproaehes the rack. When the clog has oompletecl its p'i'ESCIflbELl throw, the tletent is in engagement with the melt The rack cannot then rise out of engage uent with the (log, and be overthrown. 5 must stop when the clog stops. At the. pin 1'? is held at the upper end of the slot 17 in the lever 16 anal is it the upper most point of the cam 34:. The lever arm. 26 is at this time depressed to its lowestposition. The lever 26-33 is thus looked against movement by the lever 16 on the one hand, and loy the met: on the other howl. the throw of the (log is positively determined by the engagement of the left hand entl well of the slot in the (log, with the. pivot pin 2% on the lever arm 26. When the hack-splicing key 10 is released, the levers 16, 14, 13 11, and the key, are re turned to normal position by a. coil spring 36 which at one eiitl en the frame, and atihe. other end engages The lever arm 16 inv returning to normal position carries with it the lever The to turn movement. of the. cam 352 permits the (log ll to chop away from the melt 1; anti. the tooth 31 on the lever 18, by engagement with the pin 29 on the (log, slides the dog back longitudinally until its pivot pin 2% engages the right hand enol of the slot 25, when the dog is again in normal position. The spring acting through the lever 16, lever 18. pin 29, dog 9 anti pin 24 returns the rocket to normal positiim, as cleter mined; by a stop on the. illitli'is. The tooth co mi N 31 by engagement. with the "pin acts as a stop to determine the normal position of the A spring 3'? attached at one entl to the lever 26--33 and at the other encl to the lever 18 is put under tension when these levers are moved on the depression of the key 10; and, when the key is re leaseol, so that the pin 1? is moved back over the'eain 34: bythe lever 18, the spring El" draws the lever i2l-33 to normal position, thus lemming the stops 27 un'vl from the reel; uml eseapen'ient mechanism, respectively.

A brief suuiumiy oi the operation of the parts us "follows: Depression of the key 10 reeks the level 11, lifts the link-oi the thrust lUCl i 3, and lOClIS the lever lat-16 to the right against the action oi? the spring 36. The lever mini 16 in this movement, rocks the lever 18 around its pivot i During theiii'sl, port of its movement, the level 18 by virtue of the cam 32 swings the (log up around its pivot. into engagement with the YfiClL l urtl'ie'r movement oi'ljlie. lever 18 causes the tooth 36 by engzi meet with the lever arm 16.-

IlOl

the pin 29, to shift the dog bodily longitudinally on its pivot pin 2 L, thus back-spacing the rack. During this bodily shift of the dog 9, pin 17, by engagementwith the cam 34 of the lever 2633, rocks that lever against the action of the spring 37 until the detent- 27 engages the rack 1 and the detent 28 engages escapement wheel 6. \Vhen the detent 27 engages the rack, further movement of the lever 26-33 is impossible. The movement of the rocker is stopped by the frame. The throw .of the dog with the rack is stopped by the pin 24 on the rocker engaging the end wall of the slot 25. The rack is locked between the dog and the detent 27 and therefore cannot be overthrown. On release of the key, the spring 86 returns the key lever system and the rocker; and the spring 37 returns the stop lever 26-33, as heretofore described. I

'Ihe structure shown and described is capable of considerable modification within the scope of the inventihn. Portions of the improvements may be used without others.

Having thus described my invention, I claim-z 1. lln a typewrit-ing machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a lever having a cam thereon for moving the dog into engagement with the rack, means for operating the lever, and means on the lever for moving the dog with the rack when the dog and rack are in engagement.

2. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a lever having a cam for moving the dog into engagement with the rack, said lever having also a detent for engaging and.

moving the dog with the rack after the dog has been brought to the rack by the cam, and means for operating the lever.

3. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a lever having a cam for moving the dog into eng'agementwith the rack, said lever having also means for engaging and moving the dog with the rack after the dog has been brought to the rack by the cam, and means for operating the lever.

4. In a typewrit-ing machine, a carriage, a rack on the carriage, escapement mechanism coiiperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a pivoted arm or lever on which the dog is pivotally mounted to swing into and out of engagement with the rack, the dog having also longitudinal movement on said arm or lever to move with the rack during the'back spacing operation, and means for actuating the dog. Y

5. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable"v with the rack to back space the same, a support for the dog, the dog having a single pin and slot engagement with its support whereby it may swing on its support into engagement with the rack and may thereafter by virtue of the slot move longitudinally on its support with the rack in Back spacing, and means for actuating the 6. In a t-ypewriting machine, a carriage,

a rack on the'carriage, escapement mecha-- nism cooperating with the rack to control the feedof the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a support for the dog, the dog having a single pin and slot engagement with its support whereby it may swing on its support into engagement with the rack and may thereafter by virtue of the lot move longitudinally on its support witu the rack in back spacing, the end wall of the slot serving, by engagement with the pin, as a stop to limit the throw of the dog with the rack, and means for actuating the dog.

7. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement wit-h the rack and movable with the rack to back space the same, a support for the dog, the dog having a pin and slot engagement'with its support whereby it may swing on its support into engagement with the rack and may thereafter by virtue of the slot move longitudinally on its support with the rack in back spacing, a lever engaging the dog to actuate the same, and means for actuating said lever.

'8. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a support for the dog, the dog having a pin and slot engagement with its support whereby it may swing on its support into engagement with the rack and may therefill til

mini, mum

after by virtue of the slot move longitudinally on its support with the rack in back spacing, a lQ'E-"BK engaging the dog to actuate the same, "the lever having a cam engagement with the dog to swing; the dog to the rack, and having means for engaging and carrying thedog with the rack after the cam or sed the dog to engage the rack.

9. In a typewriting machine, a carriage, arack on the carriage, escapement mechanism cooperating with the rack to control the feed. of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a lever-arm oarryinga stop, and a cam for moving said lever arm to bring the stop into engagement with the rack to pre vent movement of the away tromthe dog, and means for actuating said cam and dog.

10. in a typewriting machine, a carriage, a rack on the carriage, escapoment mechanism co iperating with the rack to control the feed of thecarriage, a dog movable into and out of-en agement with the rack and movable with the rack to back spacethe same, a lever-arm carrying a stop, and a cam for moving said. lever arm to bring the stop into engagement with the rack to prevent movement of the rack away from the dog, and a lever engaging said dog and said stop arm cam for actuating the same.

11. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the-feed of the carriage, a dogmovable' into and out of engagement with the rack and movable with the rack to back spacethe same, a lever carrying a stop, a cam on said stop lever whereby the stop lever actuated to bring the stop into engagement with the rack to prevent movementof the rack away from the dog, a lever for actuating the dog, and means on said dog actuating;

lever for engaging the stop lever cam to actuate the latter.

12. In a typewriting machine, a carriage, a rack on the carriage, escapement mechaqnism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a lever carrying a stop, a cam on said stop lever whereby the stop lever is actuated to bring the stop into engagement with the rack to prevent movement of the rack away from the dog, a' lever for actl'iating the dog, a cam on said dog actuating lever to move the dog into engagement with the rack, and a pin on said dog actuating lever for engaging the cam on the stop lover to actuate the latter.

13. In a typewriting machine, a carriage, a rack on. the carriage, esoapement mechaweaves nism coiiperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a lever carrying a stop, a camon said stop lever whereby the stop lever is actnated to bring the stop into engagement with the rack to prevent movement of the rack away from the dog, adever for actuating the dog, a cam on said dog actuating lever to move the dog into engagement with the rack, pin on said dog actuating lever for engaging the cam on the stop lever to actuate the latter, and a key operated lever on gagingsaid pin to move said dog actuating lever.

14. In a typewriting machine, a carriage, a rack on the carriage, esoapement mechanism cooperating with the rack to control the feed of the carriage. a dog movable into and out of engagement with the rack and movable with the rack to back space the same, said dog being mounted to swing on its support into and out of engagement with the rack and to movelongitudinally on its support with the rack, a lever carry ng a cam to swing the dog and a detent to shiftthe dog longitudinally, a lever carrying a stop movable into engagement with the rack to prevent shifting the rack away from the dog, and a cam onsaid stop lover engaged by said dog actuating lever to bring the stop to the rack when the dog is actuated.

15. in a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed or" the carriage, a dog movable into and out of engagement with the rack and.- movable with the rack to back spae the same, said dog being mounted to sw ng on its support into and out of engagement with the rack and to move longitudinally on its support with the rack, a lever carrying a cam to swing the dog and a detent to shift the dog longitudinally, a lever carrying a stop movable into engagement with the rack? to prevent shifting the rack away from the dog, and a cam on said stop lever engaged by said dog actuating lever, said last-named cam acting to bring the stop to the rack aIter the dog has engaged the rack.

16. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and inoinble with the rack to back space the same, said dog being mounted to swing on its support into and out of engagement with. the rack and toniove longitudinally on its support with the rack, a lever carrying a cam to swing the dog and a detcnt to shift the dog longitudinally, a lever carrying a stop movable into engagement with the rack to prevent shifting the rack away from the dog, and a cam on said stop lever engaged by said clog actuating lever, said -lastnamed cam acting, during the longitudinal shift of the dog, to bring the stop to the rack.

17 In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and vmovable with the rack to back space the same, a lever arm carrying a stop, and a cam for moving said lever arm to bring the stop into engagement with the escapement mechanism, to prevent back ,movement of the latter, and means for actuating the dog and cam.

18. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to backspace the same, a lever arm carrying a stop, and a cam for moving said lever arm to bring the stop into engagement with the escapement mechanism, to prevent back movement of the latter, and a lever engaging said dog and said stop arm cam for actuating the same.

19. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rackto control the feed of the carriage, a (log movable into and out of engagement with the rack and movable with the rack same, a lever carrying a stop, a cam on said to back space the stop lever whereby the stop lever is actuated to bring the stop into engagement with the rack to prevent. movement of the rack away from the dog, a lever for actuating the dog, a cam on said dog actuating lever to move the dog into engagement with the rack, and a pin on said dog actuating lever for engaging the cam on the stop lever to actuate the latter; said'stop lever carrying a second stop to engage the. escapement mechanism when said lever is'actu'ated.

20. In a typevvriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating With the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable with the rack to back space the same, a lever for operating the dog, a stop arm for preventing movement of the rack away from the dog, and a spring connecting the stop arm and dog actuating lever to return the stop arm to normal position.

21. In a typewriting machine, a carriage, a rack on the carriage, escapement mechanism cooperating with the rack to control the feed of the carriage, a dog movable into and out of engagement with the rack and movable With the rack to back space the same, a lever for operating the dog, a stop arm for holding the escapement mechanism, and a spring connecting the stop arm and dog actuating lever to return the stop arm to normal position.

BENJAMIN P. FOBTIN'. lVitnesses W. M. DYORKMAN, FRANK A. (3001:.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0." 

